<template >
    <div id="app">
        <p :style="{with:getWidth}" style="border :1px solid black">我是子组件mycom2</p>
    </div>
</template>
<script>
export default {
    props:["childWidth"],
    computed:{
        getWidth(){
            return this.childWidth+"px";
        }
    }
};
</script>
<style>
    
</style>